The main fuel pump control unit is located under the right hand rear passenger side trim panel.
The sub fuel pump relay is located in the boot behind the right hand side trim panel.
When you say hardwire the pumps, are you planning to remove the fuel pump control unit and sub fuel pump relay completely? Or are you just uprating the wiring between them and the pumps?
The primary pump has 3 voltage steps which is controlled by the pump control module.Do you know what the function of the OEM fuel controller is?
Does the fuel pump current & voltage supply change with load?